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Tendonitis (Tendon Inflammation)

What is Tendonitis?

Tendonitis, also spelled tendinitis, is the inflammation or irritation of a tendon—the thick, fibrous cords that attach muscle to bone. When a tendon is overstressed, micro‑tears develop and the body responds with inflammation, causing pain, swelling, and reduced strength. While “tendonitis” is the lay‑person term, clinicians may also use “tendinopathy” to describe chronic tendon changes that are not purely inflammatory.

The condition most commonly affects the shoulders, elbows, wrists, knees, and heels, but any tendon in the body can be involved. It is a frequent complaint among athletes, manual laborers, and people who perform repetitive motions (e.g., typing, knitting, or using hand tools).

Common Causes

Understanding what provokes tendonitis helps in both treatment and prevention. Below are the most frequent triggers, grouped by mechanical, medical, and lifestyle factors.

• Repetitive strain – Repeating the same motion (e.g., throwing a baseball, swinging a racket) overloads the tendon.
• Sudden increase in activity – Rapidly upping training volume or intensity can outpace tendon adaptation.
• Improper technique – Poor form (e.g., incorrect lifting posture) concentrates stress on specific tendons.
• Age‑related degeneration – Tendons lose elasticity after age 40, making them more vulnerable.
• Underlying systemic diseases – Rheumatoid arthritis, gout, diabetes, and lupus can predispose to tendon inflammation.
• Medication side‑effects – Fluoroquinolone antibiotics and statins have been linked to tendon problems.
• Direct trauma – A fall or blunt blow can injure a tendon, leading to secondary inflammation.
• Cold or damp environments – Reduced blood flow in cold weather may impair tendon healing.
• Occupational hazards – Jobs requiring repetitive gripping, vibrating tools, or overhead work (e.g., carpentry, assembly line) increase risk.
• Poor flexibility or muscle imbalance – Tight muscles pull unevenly on tendons, creating focal stress points.

Associated Symptoms

While pain is the hallmark of tendonitis, several other signs often accompany it:

• Localized tenderness – The area feels sore to the touch, especially over the affected tendon.
• Swelling or thickening – Fluid may accumulate, making the tendon feel “rubbery.”
• Stiffness – Particularly after periods of rest (e.g., morning stiffness).
• Crepitus – A grinding or crackling sensation when moving the joint.
• Reduced range of motion – The joint may not move as freely as before.
• Weakness – The muscle attached to the tendon may feel weaker, affecting performance.
• Warmth or redness – Indicates active inflammation; more common in acute cases.

When to See a Doctor

Most cases of tendonitis improve with rest and self‑care, but medical evaluation is warranted when any of the following occur:

• Pain persists beyond 2‑3 weeks despite home treatment.
• Swelling, bruising, or a feeling of “popping” at the site.
• Severe pain that awakens you at night or interferes with sleep.
• Loss of strength that prevents you from performing daily activities.
• Any sign of infection (fever, redness that spreads, foul odor).
• History of recent fluoroquinolone use or systemic disease that could affect tendons.

If you’re an athlete, early evaluation can prevent chronic problems that might jeopardize a season or career.

Diagnosis

Diagnosing tendonitis is primarily clinical, but imaging can confirm the diagnosis and rule out other conditions.

Clinical Examination

• History taking – Duration, activity patterns, recent injuries, medications, and medical conditions.
• Physical exam – Palpation for tenderness, assessment of range of motion, strength testing, and specific provocative maneuvers (e.g., “Jobe” test for shoulder tendonitis).

Imaging Studies

• Ultrasound – Real‑time view of tendon thickness, tears, and fluid collections; inexpensive and dynamic.
• MRI – Provides detailed images of tendon quality, surrounding structures, and can differentiate chronic tendinosis from acute inflammation.
• X‑ray – Usually normal for tendonitis but helps exclude bone fractures or osteoarthritis.

Lab Tests (Rarely Needed)

Blood work is ordered only if an underlying systemic disease is suspected (e.g., elevated CRP/ESR for inflammatory arthritis, uric acid for gout).

Treatment Options

Management combines symptom relief, promoting tendon healing, and addressing the root cause.

Conservative (Home) Care

• Rest & activity modification – Avoid the aggravating motion for 1–2 weeks; switch to low‑impact activities (e.g., swimming, cycling).
• Ice application – 15‑20 minutes every 2‑3 hours during the first 48‑72 hours reduces swelling.
• Compression – Elastic bandages or sleeves provide gentle support.
• Elevation – Keep the limb above heart level when possible.
• Non‑steroidal anti‑inflammatory drugs (NSAIDs) – Ibuprofen 400‑600 mg every 6‑8 h or naproxen 250‑500 mg twice daily for up to 10 days (consult a pharmacist for contraindications).
• Topical NSAIDs – Diclofenac gel may be useful for superficial tendons (e.g., patellar).
• Physical therapy – A structured program focusing on eccentric strengthening, stretching, and gradual loading (strong evidence for Achilles and rotator‑cuff tendonitis).
• Modalities – Therapeutic ultrasound, laser therapy, or shockwave therapy can augment healing in chronic cases.

Pharmacologic Interventions

• Corticosteroid injection – Provides rapid pain relief but may weaken the tendon if repeated; reserved for severe, short‑term cases.
• Platelet‑rich plasma (PRP) – Autologous blood product injected around the tendon; emerging evidence supports benefit for chronic tendinopathy.
• Analgesic creams – Capsaicin or menthol preparations for mild discomfort.

Surgical Options

Surgery is rare (<5 % of cases) and considered only when:

• There is a full‑thickness tendon tear.
• Conservative care fails after 6–12 months.
• Recurrent tendon rupture threatens function.

Procedures range from debridement of degenerative tissue to tendon repair or grafting.

Rehabilitation Timeline

Phase	Duration	Goals
Acute (0‑2 weeks)	1‑2 weeks	Pain control, reduce inflammation, protect tendon.
Sub‑acute (2‑6 weeks)	2‑4 weeks	Gentle range‑of‑motion and isometric strengthening.
Re‑conditioning (6‑12 weeks)	4‑6 weeks	Eccentric loading, functional drills, gradual return to sport.

Prevention Tips

Most tendonitis cases can be avoided with smart lifestyle choices and proper ergonomics.

• Warm‑up thoroughly – 5‑10 minutes of light cardio plus dynamic stretching before activity.
• Progress gradually – Increase intensity or duration by no more than 10 % per week.
• Maintain flexibility – Stretch major muscle groups at least 3 times per week.
• Strengthen supporting muscles – Balanced strength reduces abnormal tendon loading.
• Use proper equipment – Shoes with adequate cushioning, ergonomic tools, and sport‑specific gear.
• Take regular breaks – Follow the 20‑20‑20 rule for repetitive tasks (20 seconds pause every 20 minutes, look 20 feet away).
• Stay hydrated and nourished – Adequate protein and collagen‑supporting nutrients (vitamin C, zinc) help tendon health.
• Monitor medication use – Discuss alternatives with a physician if you need fluoroquinolones or high‑dose steroids.
• Address early discomfort – Treat mild soreness with rest and ice before it escalates.

Emergency Warning Signs

If you experience any of the following, seek immediate medical attention (e.g., urgent care or emergency department). These signs may indicate a tendon rupture, infection, or a serious underlying condition.

• Sudden, severe “pop” sensation followed by intense pain.
• Visible gap or deformity in the tendon area.
• Rapidly spreading redness, warmth, or swelling with fever.
• Inability to move the joint at all (complete loss of function).
• Severe pain that does not improve with rest, ice, or NSAIDs within 48 hours.

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Sources: Mayo Clinic, CDC, National Institutes of Health (NIH), World Health Organization (WHO), Cleveland Clinic, American Journal of Sports Medicine, Journal of Orthopaedic & Sports Physical Therapy.

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